You are justifying your wrong statement, but linking those statements. You do if you sell privately. If you sell to Tesla I don't know what happens in practice - but I recall some kind of % of what you paid as the trade in value. That should include what you paid for FSD.
I think this notion of a month to month subscription, that you can turn on or off, at will, won't fly. That's chaos from a pricing perspective. It's likely to be more like a wireless contract with AT&T. You pay monthly but sign up for a fixed term, subject to early termination fees. So, maybe something like $150/mon for a 12-month contract or $120/mon for a 4 year contract. Rates subject to change. Taxes not included. Void where prohibited by law.
No, there are threads here about various cases where a car was misrepresented when it was sold. Tesla don’t disable software features when you sell your car privately. What has happened is there have been occasions when purchases from a reseller have been misrepresented (perhaps accidentally) and, very occasionally, a car that was purchased used from Tesla (perhaps indirectly) was incorrectly configured, and subsequently lost a feature during a software update. These are the cases that generate (justifiably) anger on the part of the final buyer, but that is very different from Tesla disabling features on your car if you sell it privately.
Agreed, with maybe a one-month trial period. I think the motivator here for Tesla is to capture the lease purchases, who are far less likely to get FSD (for obvious reasons). But as others have noted I doubt they can make $150/month work based on the current purchase price.
My guess is that it will arrive more or less at the same time as the open beta release of FSD (that is, when anyone with FSD/HW3 can use it, but its still officially a "beta").